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L6925D

September 2003

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2.7V TO 5.5V BATTERY INPUT RANGE

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HIGH EFFICIENCY: UP TO 95%

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INTERNAL SYNCHRONOUS SWITCH

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NO EXTERNAL SCHOTTKY REQUIRED

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EXTREMELY LOW QUIESCENT CURRENT

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800mA MAX OUTPUT CURRENT

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ADJUSTABLE OUTPUT VOLTAGE FROM 0.6V

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LOW DROP-OUT OPERATION: UP TO100%

DUTY CYCLE

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SELECTABLE LOW NOISE/LOW

CONSUMPTION MODE AT LIGHT LOAD

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LOW BATTERY INPUT

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LOW BATTERY OUTPUT

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±1% OUTPUT VOLTAGE ACCURACY

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CURRENT-MODE CONTROL

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600kHz SWITCHING FREQUENCY

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EXTERNALLY SYNCHRONIZABLE FROM

500kHz TO 1.4MHz

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OVP

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SHORT CIRCUIT PROTECTION

APPLICATIONS

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BATTERY-POWERED EQUIPMENTS

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PORTABLE INSTRUMENTS

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CELLULAR PHONES

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PDAs AND HAND HELD TERMINALS

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DSC

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GPS

DESCRIPTION

The device is dc-dc monolithic regulator specifically

designed to provide extremely high efficiency.

The device has on UVLO set at 2.7V cause it is part-

icurarly thought for single Li-ion cell applications.

Output voltage can be selected by an external divider

down to 0.6V. Duty Cycle can saturate to 100% al-

lowing low drop-out operation. The device is based

on a 600kHz fixed-frequency, current mode-architec-

ture. Low Consumption Mode operation can be se-

lected at light load conditions, allowing switching

losses to be reduced. L6925D is externally synchro-

nizable with a clock which makes it useful in noise-

sensitive applications. LBI pin can be used to have a

LBO signal when the Battery voltage is lower than a

preset value. Other features like, Overvoltage protec-

tion, Shortcircuit protection and Thermal Shutdown

(150°C) are also present.

MSOP8

ORDERING NUMBERS: L6925D (Tube)

L6925013TR (Tape & Reel)

HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS

STEP DOWN REGULATOR

APPLICATION TEST CIRCUIT

L 6.8

µH

SYNC

LX

VFB

C1

10

µF

6.3V

C2

220pF

C4

10

µF

6.3V

R4

200K

R2

600K

R1

100K

R3

100K

LBI

COMP

GND

LBO

D01IN1238B

7

6

1

8

3

5

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